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杜赵新,刘国龙,崔晓明,刘慧敏,程军.预时效工艺对Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe钛合金组织与性能的影响[J].稀有金属材料与工程(英文),2019,48(6):1904~1908.[Du Zhaoxin,Liu Guolong,Cui Xiaoming,Liu Huimin and Cheng Jun.Effect of Pre Aging Microstructure on the Mechanical Properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe[J].Rare Metal Materials and Engineering,2019,48(6):1904~1908.]
Effect of Pre Aging Microstructure on the Mechanical Properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe
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Received:December 04, 2017  Revised:February 03, 2018
Key words: duplex aging  high strength β titanium alloy  omega phase  microstructure  mechanical properties
Foundation item:国家自然科学基金青年基金(项目号516010990);内蒙古自然科学基金(项目号2016BS0506);内蒙古工业大学科学研究重点基金(项目号ZD201607); 内蒙古自治区重大基础研究开放课题
Author NameAffiliation
Du Zhaoxin,Liu Guolong,Cui Xiaoming,Liu Huimin and Cheng Jun  
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      The microstructure evolution and mechanical properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe alloy after single and duplex aging treatment were studied. The Single aging temperature was 550℃, the duplex aging was pre-aged at 400 ℃ then re-aged at 550℃. The results showed that when the alloy pre-aged at 400℃, the ω phase was precipitated. As the pre-aging time prolonged, the ω phase finally changed to the α phase. Duplex aging was effective to yield the α phase fine dispersion, and the pre precipitated isothermal ω phase provided more uniform nucleation position for precipitation of α phase than single aging so as to improve the alloy tensile strengthen greatly. During pre aging, the isothermal ω phase could precipitate sufficiently so as to provide more advantageous nucleation position to precipitate very fine α phase of acicular style, and the strengthening effect was the same with that of duplex aging.